[jira] [Created] (CALCITE-5044) OrderBy constant executing RelToSql ambiguously

["Xurenhe (Jira)" <ji...@apache.org>]

Xurenhe created CALCITE-5044:
--------------------------------

             Summary: OrderBy constant executing RelToSql ambiguously
                 Key: CALCITE-5044
                 URL: https://issues.apache.org/jira/browse/CALCITE-5044
             Project: Calcite
          Issue Type: Improvement
            Reporter: Xurenhe
            Assignee: Xurenhe


 

There is ambiguous in the rel-to-sql's converter when meeting `order by constant `.

Here is an example:
{code:java}
@Test void testOderByConstant() {
  final Function<RelBuilder, RelNode> relFn = b -> b
      .scan("EMP")
      .project(b.literal(1), b.field(1), b.field(2))
      .sort(RelCollations.of(ImmutableList.of(
          new RelFieldCollation(0), new RelFieldCollation(1))))
      .project(b.field(2), b.field(1))
      .build();
  final String expected = "SELECT *\n"
      + "FROM \"scott\".\"EMP\"\n"
      + "WHERE \"COMM\" IS NULL OR \"COMM\" <> 1";
  relFn(relFn).ok(expected);
} {code}
Return sql:

 

 
{code:java}
SELECT "JOB", "ENAME"
FROM "scott"."EMP"
ORDER BY 1, "ENAME" {code}
But, `ORDER BY 1` may mean 'sort by the first column in the select list'  because of SqlConformance#isSortByOrdinal.

 

I keep this the same semantics, by apply the rule of `CoreRules#SORT_REMOVE_CONSTANT_KEYS`



Should the rel_to_sql's converter support it natively?

 

 



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